typedef enum {
    	EQUAL = 1,
	LESS_THAN = 2,
	GREATER_THAN = 3, 
	LESS_THAN_OR_EQUAL = 4, 
	GREATER_THAN_OR_EQUAL = 5,
	NOT_EQUAL = 6
}OPERATOR;

typedef struct{
	
	OPERATOR op;
	char * value;
	char attrtype;		//c, i , f
	int attrlength;
	int fileDesc;	//-1 einai free entry
	int lastRecAccessed; //init at -1
	int recordSize;
	int offset;
	
}ScanMatrix;

void SMM_Init();

